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Backplate LEDs are on but the faceplate is not powering on. What could be causing this?

Check the power supply to ensure the thermostat is getting the proper voltage (about 24 volts). The red wire from the backplate and the red wire from the thermostat cable must both be in the R terminal. The black wire from the backplate and the common (color varies) wire from the thermostat cable must both be in the 24V(c) terminal.

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